It's hard to find people that like to play old games or mods for old games. Even when you do it's hard to get them to actually play with you. I used to play Armada 2 quite a bit back in the day but I was always too bad at it to really play with other people. I have a Mechwarrior 3 group I play with and our Discord channel has a ton of people but only about 6 or so people play on a regular basis.